private static void checkGarbageCollectionNotificationInfoContent(
GarbageCollectionNotificationInfo notif) throws Exception {
System.out.println("GC notification for " + notif.getGcName());
System.out.print("Action: " + notif.getGcAction());
System.out.println(" Cause: " + notif.getGcCause());
GcInfo info = notif.getGcInfo();
System.out.print("GC Info #" + info.getId());
System.out.print(" start:" + info.getStartTime());
System.out.print(" end:" + info.getEndTime());
System.out.println(" (" + info.getDuration() + "ms)");
Map<String, MemoryUsage> usage = info.getMemoryUsageBeforeGc();
List<String> pnames = new ArrayList<String>();
for (Map.Entry entry : usage.entrySet()) {
String poolname = (String) entry.getKey();
pnames.add(poolname);
MemoryUsage busage = (MemoryUsage) entry.getValue();
MemoryUsage ausage = (MemoryUsage) info.getMemoryUsageAfterGc().get(poolname);
if (ausage == null) {
throw new RuntimeException("After Gc Memory does not exist" + " for " + poolname);
}
System.out.println("Usage for pool " + poolname);
System.out.println(" Before GC: " + busage);
System.out.println(" After GC: " + ausage);
}
// check if memory usage for all memory pools are returned
List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
for (MemoryPoolMXBean p : pools) {
if (!pnames.contains(p.getName())) {
throw new RuntimeException(
"GcInfo does not contain " + "memory usage for pool " + p.getName());
}
}
}
public void handleNotification(Notification notif, Object handback) {
String type = notif.getType();
if (type.equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) {
GarbageCollectionNotificationInfo gcNotif =
GarbageCollectionNotificationInfo.from((CompositeData) notif.getUserData());
String source = ((ObjectName) notif.getSource()).getCanonicalName();
synchronized (synchronizer) {
if (listenerInvoked.get(source) == null) {
listenerInvoked.put(((ObjectName) notif.getSource()).getCanonicalName(), gcNotif);
count++;
if (count >= number) {
synchronizer.notify();
}
}
}
}
}